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Dr. Georgios Kamaris
Liverpool John Moores University

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Research Keywords & Expertise

0 Performance Based Design
0 Structural Engineering
0 Structural Modeling
0 Finite Element Analysis (FEA)
0 aluminium structures

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Finite Element Analysis (FEA)
Steel structures

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Journal article
Published: 06 August 2021 in CivilEng
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Research studies have been reported on aluminium alloy tubular and doubly symmetric open cross-sections, whilst studies on angle cross-sections remain limited. This paper presents a comprehensive numerical study on the response of aluminium alloy angle stub columns. Finite element models are developed following a series of modelling assumptions. Geometrically and materially nonlinear analyses with imperfections included are executed, and the obtained results are validated against experimental data available in the literature. Subsequently, a parametric study is carried out to investigate the local buckling behaviour of aluminium alloy angles. For this purpose, a broad range of cross-sectional aspect ratios, slenderness and two types of structural aluminium alloys are considered. Their effect on the cross-sectional behaviour and strength is discussed. Moreover, the numerically obtained ultimate strengths together with literature test data are utilised to assess the applicability of the European design standards, the American Aluminium Design Manual and the Continuous Strength Method to aluminium alloy angles. The suitability of the Direct Strength Method is also evaluated and a modified method is proposed to improve the accuracy of the strength predictions.

ACS Style

Evangelia Georgantzia; Michaela Gkantou; George Kamaris. Numerical Modelling and Design of Aluminium Alloy Angles under Uniform Compression. CivilEng 2021, 2, 632 -651.

AMA Style

Evangelia Georgantzia, Michaela Gkantou, George Kamaris. Numerical Modelling and Design of Aluminium Alloy Angles under Uniform Compression. CivilEng. 2021; 2 (3):632-651.

Chicago/Turabian Style

Evangelia Georgantzia; Michaela Gkantou; George Kamaris. 2021. "Numerical Modelling and Design of Aluminium Alloy Angles under Uniform Compression." CivilEng 2, no. 3: 632-651.

Review
Published: 18 March 2021 in Applied Sciences
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Structural health monitoring (SHM) is an important aspect of the assessment of various structures and infrastructure, which involves inspection, monitoring, and maintenance to support economics, quality of life and sustainability in civil engineering. Currently, research has been conducted in order to develop non-destructive techniques for SHM to extend the lifespan of monitored structures. This paper will review and summarize the recent advancements in non-destructive testing techniques, namely, sweep frequency approach, ground penetrating radar, infrared technique, fiber optics sensors, camera-based methods, laser scanner techniques, acoustic emission and ultrasonic techniques. Although some of the techniques are widely and successfully utilized in civil engineering, there are still challenges that researchers are addressing. One of the common challenges within the techniques is interpretation, analysis and automation of obtained data, which requires highly skilled and specialized experts. Therefore, researchers are investigating and applying artificial intelligence, namely machine learning algorithms to address the challenges. In addition, researchers have combined multiple techniques in order to improve accuracy and acquire additional parameters to enhance the measurement processes. This study mainly focuses on the scope and recent advancements of the Non-destructive Testing (NDT) application for SHM of concrete, masonry, timber and steel structures.

ACS Style

Patryk Kot; Magomed Muradov; Michaela Gkantou; George Kamaris; Khalid Hashim; David Yeboah. Recent Advancements in Non-Destructive Testing Techniques for Structural Health Monitoring. Applied Sciences 2021, 11, 2750 .

AMA Style

Patryk Kot, Magomed Muradov, Michaela Gkantou, George Kamaris, Khalid Hashim, David Yeboah. Recent Advancements in Non-Destructive Testing Techniques for Structural Health Monitoring. Applied Sciences. 2021; 11 (6):2750.

Chicago/Turabian Style

Patryk Kot; Magomed Muradov; Michaela Gkantou; George Kamaris; Khalid Hashim; David Yeboah. 2021. "Recent Advancements in Non-Destructive Testing Techniques for Structural Health Monitoring." Applied Sciences 11, no. 6: 2750.

Short communication
Published: 03 August 2020 in Soil Dynamics and Earthquake Engineering
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A rational and efficient seismic design method for regular space steel frames using inelastic (pushover) analysis (PA) is presented. This method employs an advanced static finite element analysis that takes into account geometrical and material non-linearities and member and frame imperfections. Resistances (strengths) are computed according to Eurocodes 3. The PA is employed with multimodal lateral loads along the height of the building combining the first few modes. The design starts with assumed member sections, continues with deformation and damage check at three performance levels with the aid of PAs and ends with the adjustment of member sizes. Thus, it can sufficiently capture the limit states of displacements, strength, stability and damage of the structure and its individual members so that separate member capacity checks through the interaction equations of Eurocode 3 or the use of the behavior factor q suggested in Eurocode 8 are not required. One numerical example dealing with the seismic design of a one bay in both horizontal directions and three storey steel moment resisting frame is presented to illustrate the method and demonstrate its advantages.

ACS Style

A.A. Vasilopoulos; G.S. Kamaris. Seismic design of space steel frames using advanced static inelastic (pushover) analysis. Soil Dynamics and Earthquake Engineering 2020, 137, 106309 .

AMA Style

A.A. Vasilopoulos, G.S. Kamaris. Seismic design of space steel frames using advanced static inelastic (pushover) analysis. Soil Dynamics and Earthquake Engineering. 2020; 137 ():106309.

Chicago/Turabian Style

A.A. Vasilopoulos; G.S. Kamaris. 2020. "Seismic design of space steel frames using advanced static inelastic (pushover) analysis." Soil Dynamics and Earthquake Engineering 137, no. : 106309.

Journal article
Published: 26 November 2019 in Sensors
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This paper investigates the possibility of applying novel microwave sensors for crack detection in reinforced concrete structures. Initially, a microstrip patch antenna with a split ring resonator (SRR) structure was designed, simulated and fabricated. To evaluate the sensor’s performance, a series of structural tests were carried out and the sensor responses were monitored. Four reinforced concrete (RC) beam specimens, designed according to the European Standards, were tested under three-point bending. The load was applied incrementally to the beams and the static responses were monitored via the use of a load cell, displacement transducers and crack width gauges (Demec studs). In parallel, signal readings from the microwave sensors, which were employed prior to the casting of the concrete and located along the neutral axis at the mid-span of the beam, were recorded at various load increments. The microwave measurements were analysed and compared with those from crack width gauges. A strong linear relationship between the crack propagation and the electromagnetic signal across the full captured spectrum was found, demonstrating the technique’s capability and its potential for further research, offering a reliable, low-cost option for structural health monitoring (SHM).

ACS Style

Michaela Gkantou; Magomed Muradov; George S. Kamaris; Khalid Hashim; William Atherton; Patryk Kot. Novel Electromagnetic Sensors Embedded in Reinforced Concrete Beams for Crack Detection. Sensors 2019, 19, 5175 .

AMA Style

Michaela Gkantou, Magomed Muradov, George S. Kamaris, Khalid Hashim, William Atherton, Patryk Kot. Novel Electromagnetic Sensors Embedded in Reinforced Concrete Beams for Crack Detection. Sensors. 2019; 19 (23):5175.

Chicago/Turabian Style

Michaela Gkantou; Magomed Muradov; George S. Kamaris; Khalid Hashim; William Atherton; Patryk Kot. 2019. "Novel Electromagnetic Sensors Embedded in Reinforced Concrete Beams for Crack Detection." Sensors 19, no. 23: 5175.

Short communication
Published: 01 May 2019 in Soil Dynamics and Earthquake Engineering
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An assessment of the seismic behaviour of space mixed steel frame systems consisting of buckling restrained braced frames perimetrically and moment resisting frames internally is made by dynamic inelastic analyses. In this work 20 regular space steel frames of the above mixed type with uniaxial natural eccentricity are designed in accordance with Eurocodes 3 and 8 and subjected to 42 pairs of far-field seismic excitations. Through extensive nonlinear dynamic analyses involving four performance levels defined by their corresponding interstorey drift ratios, a seismic response databank for these frames is created in terms of displacements, maximum interstorey drift ratios, member ductilities, eccentricities and behaviour factors values. Thus, on the basis of these analyses, the seismic behaviour of this mixed type of frames is assessed and the influence of eccentricity on the response parameters examined is evaluated.

ACS Style

Angelos S. Tzimas; George S. Kamaris; Georgios Stefopoulos. Seismic analysis and behaviour of mixed MRF/BRB regular steel space frames with uniaxial eccentricity. Soil Dynamics and Earthquake Engineering 2019, 123, 31 -35.

AMA Style

Angelos S. Tzimas, George S. Kamaris, Georgios Stefopoulos. Seismic analysis and behaviour of mixed MRF/BRB regular steel space frames with uniaxial eccentricity. Soil Dynamics and Earthquake Engineering. 2019; 123 ():31-35.

Chicago/Turabian Style

Angelos S. Tzimas; George S. Kamaris; Georgios Stefopoulos. 2019. "Seismic analysis and behaviour of mixed MRF/BRB regular steel space frames with uniaxial eccentricity." Soil Dynamics and Earthquake Engineering 123, no. : 31-35.

Journal article
Published: 01 May 2016 in Engineering Structures
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Simple empirical expressions to estimate maximum seismic damage on the basis of four well known damage indices for planar regular steel/concrete composite moment resisting frames having steel I beams and concrete filled steel tube (CFT) columns are presented. These expressions are based on the results of an extensive parametric study concerning the inelastic response of a large number of frames to a large number of ordinary far-field type ground motions. Thousands of nonlinear dynamic analyses are performed by scaling the seismic records to different intensities in order to drive the structures to different levels of inelastic deformation. The statistical analysis of the created response databank indicates that the number of stories, beam strength ratio, material strength and ground motion characteristics strongly influence structural damage. Nonlinear regression analysis is employed in order to derive simple formulae, which reflect the influence of the aforementioned parameters and offer a direct estimation of the damage indices used in this study. More specifically, given the characteristics of the structure and the ground motion, one can calculate the maximum damage observed in column bases and beams. Finally, three examples serve to illustrate the use of the proposed expressions and demonstrate their accuracy and efficiency.

ACS Style

George Kamaris; Konstantinos Skalomenos; George D. Hatzigeorgiou; Dimitri E. Beskos. Seismic damage estimation of in-plane regular steel/concrete composite moment resisting frames. Engineering Structures 2016, 115, 67 -77.

AMA Style

George Kamaris, Konstantinos Skalomenos, George D. Hatzigeorgiou, Dimitri E. Beskos. Seismic damage estimation of in-plane regular steel/concrete composite moment resisting frames. Engineering Structures. 2016; 115 ():67-77.

Chicago/Turabian Style

George Kamaris; Konstantinos Skalomenos; George D. Hatzigeorgiou; Dimitri E. Beskos. 2016. "Seismic damage estimation of in-plane regular steel/concrete composite moment resisting frames." Engineering Structures 115, no. : 67-77.

Original research paper
Published: 18 March 2016 in Bulletin of Earthquake Engineering
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The potential of post-tensioned self-centering moment-resisting frames (SC-MRFs) and viscous dampers to reduce the collapse risk and improve the residual drift performance of steel buildings in near-fault regions is evaluated. For this purpose, a prototype steel building is designed using different seismic-resistant frames, i.e.: moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as stiffness and strength deterioration. A database of 91 near-fault, pulse-like ground motions with varying pulse periods is used to conduct incremental dynamic analysis (IDA), in which each ground motion is scaled until collapse occurs. The probability of collapse and the probability of exceeding different residual story drift threshold values are calculated as a function of the ground motion intensity and the period of the velocity pulse. The results of IDA are then combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess and compare the collapse risk and the residual drift performance of the frames. The paper highlights the benefit of combining the post-tensioning and supplemental viscous damping technologies in the near-source. In particular, the SC-MRF with viscous dampers is found to achieve significant reductions in collapse risk and probability of exceedance of residual story drift threshold values compared to the MRF.

ACS Style

A. S. Tzimas; George Kamaris; T. L. Karavasilis; Carmine Galasso. Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions. Bulletin of Earthquake Engineering 2016, 14, 1643 -1662.

AMA Style

A. S. Tzimas, George Kamaris, T. L. Karavasilis, Carmine Galasso. Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions. Bulletin of Earthquake Engineering. 2016; 14 (6):1643-1662.

Chicago/Turabian Style

A. S. Tzimas; George Kamaris; T. L. Karavasilis; Carmine Galasso. 2016. "Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions." Bulletin of Earthquake Engineering 14, no. 6: 1643-1662.

Conference paper
Published: 06 August 2015 in Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing
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ACS Style

G.S. Kamaris; A.S. Tzimas; T.L. Karavasilis; C. Galasso. Collapse Risk of Self-Centering Moment Resisting Frames with Viscous Dampers in Near-Fault Regions. Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing 2015, 108, 1 .

AMA Style

G.S. Kamaris, A.S. Tzimas, T.L. Karavasilis, C. Galasso. Collapse Risk of Self-Centering Moment Resisting Frames with Viscous Dampers in Near-Fault Regions. Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing. 2015; 108 ():1.

Chicago/Turabian Style

G.S. Kamaris; A.S. Tzimas; T.L. Karavasilis; C. Galasso. 2015. "Collapse Risk of Self-Centering Moment Resisting Frames with Viscous Dampers in Near-Fault Regions." Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing 108, no. : 1.

Journal article
Published: 01 February 2015 in Engineering Structures
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ACS Style

Cyril Feau; Ioannis Politopoulos; George S. Kamaris; Charlie Mathey; Thierry Chaudat; Georges Nahas. Experimental and numerical investigation of the earthquake response of crane bridges. Engineering Structures 2015, 84, 89 -101.

AMA Style

Cyril Feau, Ioannis Politopoulos, George S. Kamaris, Charlie Mathey, Thierry Chaudat, Georges Nahas. Experimental and numerical investigation of the earthquake response of crane bridges. Engineering Structures. 2015; 84 ():89-101.

Chicago/Turabian Style

Cyril Feau; Ioannis Politopoulos; George S. Kamaris; Charlie Mathey; Thierry Chaudat; Georges Nahas. 2015. "Experimental and numerical investigation of the earthquake response of crane bridges." Engineering Structures 84, no. : 89-101.

Conference paper
Published: 01 January 2015 in Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)
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ACS Style

George Kamaris; Konstantinos Skalomenos; George Hatzigeorgiou; Dimitri Beskos. SIMPLE FORMULAE FOR DAMAGE ESTIMATION OF COMPOSITE STEEL/CONCRETE MOMENT RESISTING FRAMES. Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) 2015, 1 .

AMA Style

George Kamaris, Konstantinos Skalomenos, George Hatzigeorgiou, Dimitri Beskos. SIMPLE FORMULAE FOR DAMAGE ESTIMATION OF COMPOSITE STEEL/CONCRETE MOMENT RESISTING FRAMES. Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015). 2015; ():1.

Chicago/Turabian Style

George Kamaris; Konstantinos Skalomenos; George Hatzigeorgiou; Dimitri Beskos. 2015. "SIMPLE FORMULAE FOR DAMAGE ESTIMATION OF COMPOSITE STEEL/CONCRETE MOMENT RESISTING FRAMES." Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) , no. : 1.

Conference paper
Published: 01 January 2015 in Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)
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ACS Style

George Kamaris; Angelos Tzimas; Theodore Karavasilis; Carmine Galasso; Manolis Papadrakakis. COLLAPSE RISK EVALUATION OF SELF-CENTERING STEEL MRFS WITH VISCOUS DAMPERS IN NEAR-FAULT REGIONS. Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) 2015, 299 -317.

AMA Style

George Kamaris, Angelos Tzimas, Theodore Karavasilis, Carmine Galasso, Manolis Papadrakakis. COLLAPSE RISK EVALUATION OF SELF-CENTERING STEEL MRFS WITH VISCOUS DAMPERS IN NEAR-FAULT REGIONS. Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015). 2015; ():299-317.

Chicago/Turabian Style

George Kamaris; Angelos Tzimas; Theodore Karavasilis; Carmine Galasso; Manolis Papadrakakis. 2015. "COLLAPSE RISK EVALUATION OF SELF-CENTERING STEEL MRFS WITH VISCOUS DAMPERS IN NEAR-FAULT REGIONS." Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015) , no. : 299-317.

Original research paper
Published: 07 May 2014 in Bulletin of Earthquake Engineering
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A new method for seismic design of plane steel moment resisting framed structures is developed. This method is able to control damage at all levels of performance in a direct manner. More specifically, the method: (a) can determine damage in any member or the whole of a designed structure under any given seismic load, (b) can dimension a structure for a given seismic load and desired level of damage and (c) can determine the maximum seismic load a designed structure can sustain in order to exhibit a desired level of damage. In order to accomplish these things, an appropriate seismic damage index is used that takes into account the interaction between axial force and bending moment at a section, strength and stiffness degradation as well as low cycle fatigue. Then, damage scales are constructed on the basis of extensive parametric studies involving a large number of frames exhibiting cyclic strength and stiffness degradation and a large number of seismic motions and using the above damage index for damage determination. Some numerical examples are presented to illustrate the proposed method and demonstrate its advantages against other methods of seismic design.

ACS Style

G. S. Kamaris; G. D. Hatzigeorgiou; D. E. Beskos. Direct damage controlled seismic design of plane steel degrading frames. Bulletin of Earthquake Engineering 2014, 13, 587 -612.

AMA Style

G. S. Kamaris, G. D. Hatzigeorgiou, D. E. Beskos. Direct damage controlled seismic design of plane steel degrading frames. Bulletin of Earthquake Engineering. 2014; 13 (2):587-612.

Chicago/Turabian Style

G. S. Kamaris; G. D. Hatzigeorgiou; D. E. Beskos. 2014. "Direct damage controlled seismic design of plane steel degrading frames." Bulletin of Earthquake Engineering 13, no. 2: 587-612.

Journal article
Published: 01 January 2013 in Engineering Structures
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ACS Style

George Kamaris; George Hatzigeorgiou; Dimitri E. Beskos. A new damage index for plane steel frames exhibiting strength and stiffness degradation under seismic motion. Engineering Structures 2013, 46, 727 -736.

AMA Style

George Kamaris, George Hatzigeorgiou, Dimitri E. Beskos. A new damage index for plane steel frames exhibiting strength and stiffness degradation under seismic motion. Engineering Structures. 2013; 46 ():727-736.

Chicago/Turabian Style

George Kamaris; George Hatzigeorgiou; Dimitri E. Beskos. 2013. "A new damage index for plane steel frames exhibiting strength and stiffness degradation under seismic motion." Engineering Structures 46, no. : 727-736.

Journal article
Published: 26 October 2012 in Bulletin of Earthquake Engineering
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Simple empirical expressions to estimate maximum seismic damage on the basis of five well known damage indices for planar regular moment resisting and x-braced steel frames are presented. They are based on the results of extensive parametric studies concerning the inelastic response of a large number of these frames to a large number of ground motions. Thousands of nonlinear dynamic analyses are performed by scaling the seismic records to different intensities in order to drive the structures to different levels of inelastic deformation and finally to collapse. The statistical analysis of the created response databank indicates that the number of stories, period of vibration, stiffness ratio, capacity factor (for moment resisting frames), brace slenderness ratio and column stiffness (for x-braced frames) and characteristics of the ground motion, such as characteristic period and spectral acceleration, strongly influence damage. Nonlinear regression analysis is employed in order to derive simple formulae, which reflect the influence of the aforementioned parameters and offer a direct estimation of the damage indices used in this study. More specifically, given the characteristics of the structure and the ground motion, one can calculate the maximum damage observed in column bases and beams (for moment resisting frames) or in braces (for x-braced frames). Finally, two examples serve to illustrate the use of the proposed expressions and demonstrate their accuracy and efficiency.

ACS Style

George S. Kamaris; Yasemi-Maria Vallianatou; Dimitri E. Beskos. Seismic damage estimation of in-plane regular steel moment resisting and x-braced frames. Bulletin of Earthquake Engineering 2012, 10, 1745 -1766.

AMA Style

George S. Kamaris, Yasemi-Maria Vallianatou, Dimitri E. Beskos. Seismic damage estimation of in-plane regular steel moment resisting and x-braced frames. Bulletin of Earthquake Engineering. 2012; 10 (6):1745-1766.

Chicago/Turabian Style

George S. Kamaris; Yasemi-Maria Vallianatou; Dimitri E. Beskos. 2012. "Seismic damage estimation of in-plane regular steel moment resisting and x-braced frames." Bulletin of Earthquake Engineering 10, no. 6: 1745-1766.

Journal article
Published: 26 December 2009 in Journal of Mechanics of Materials and Structures
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ACS Style

George Kamaris; George Hatzigeorgiou; Dimitri Beskos. Direct damage-controlled design of plane steel moment-resisting frames using static inelastic analysis. Journal of Mechanics of Materials and Structures 2009, 4, 1375 -1393.

AMA Style

George Kamaris, George Hatzigeorgiou, Dimitri Beskos. Direct damage-controlled design of plane steel moment-resisting frames using static inelastic analysis. Journal of Mechanics of Materials and Structures. 2009; 4 (7):1375-1393.

Chicago/Turabian Style

George Kamaris; George Hatzigeorgiou; Dimitri Beskos. 2009. "Direct damage-controlled design of plane steel moment-resisting frames using static inelastic analysis." Journal of Mechanics of Materials and Structures 4, no. 7: 1375-1393.